CareFusion Bird Sentry Guide de l'utilisateur télécharger pdf (Page 17)

Bird Sentry™ Blender Chapter 1: Introduction

L1383 Rev. D

B Outlet Port

See Figure 1, letter O.

C O

Sensor Port

A sampling port for the oxygen sensor. It allows 3 LPM of mixed gas from the blender to flow over

the sensor membrane. The port is located on the back side of the plate.

D Medical Air Inlet Adapter

See Figure 1, letter P.

E Oxygen Inlet Adapter

See Figure 1, letter Q.

F Pressure Differential Reed Alarm Cap

An audible alarm that, when activated, indicates that a pressure differential of 20 PSI or more

exists between the two gas-source pressures.

Disposable Galvanic O

Sensor

The sensor is a galvanic, partial pressure sensor that is specific to oxygen. It consists of two electrodes

(a cathode and an anode), a Teflon membrane and an electrolyte. Oxygen diffuses through the Teflon

membrane and immediately reacts at a gold cathode. Oxygen ions are transported in the unique

electrolyte solution to a lead anode where oxidation occurs, generating an electrical current. Since the

sensor is specific to oxygen, the current generated is proportional to the amount of oxygen present in

the sample gas. When no oxygen is present, there is no chemical reaction and therefore, no current is

produced. In this sense, the sensor is self-zeroing.

Figure 3 Disposable galvanic O

cell

A Disposable Galvanic O

Cell (Refer to Figure 3)

A replaceable cartridge which contains the active elements of the galvanic oxygen sensor. When

exhausted, the cell is discarded and replaced with a new cell.

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CareFusion Bird Sentry Guide de l'utilisateur Page 17